abf157bd69
Before this patch, running the x64 new backend would require both
compiling with --features experimental_x64 and running with
`use_new_backend`.
This patches changes this behavior so that the runtime flag is not
needed anymore: using the feature flag will enforce usage of the new
backend everywhere, making using and testing it much simpler:
cargo run --features experimental_x64 ;; other CLI options/flags
This also gives a hint at what the meta language generation would look
like after switching to the new backend.
Compiling only with the x64 codegen flag gives a nice compile time speedup.
125 lines
3.4 KiB
Rust
125 lines
3.4 KiB
Rust
//! X86_64-bit Instruction Set Architecture.
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use alloc::boxed::Box;
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use regalloc::RealRegUniverse;
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use target_lexicon::Triple;
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use crate::ir::condcodes::IntCC;
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use crate::ir::Function;
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use crate::isa::Builder as IsaBuilder;
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use crate::machinst::pretty_print::ShowWithRRU;
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use crate::machinst::{compile, MachBackend, MachCompileResult, TargetIsaAdapter, VCode};
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use crate::result::CodegenResult;
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use crate::settings::{self as shared_settings, Flags};
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use crate::isa::x64::{inst::regs::create_reg_universe_systemv, settings as x64_settings};
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use super::TargetIsa;
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mod abi;
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mod inst;
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mod lower;
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mod settings;
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/// An X64 backend.
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pub(crate) struct X64Backend {
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triple: Triple,
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flags: Flags,
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_x64_flags: x64_settings::Flags,
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reg_universe: RealRegUniverse,
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}
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impl X64Backend {
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/// Create a new X64 backend with the given (shared) flags.
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fn new_with_flags(triple: Triple, flags: Flags, x64_flags: x64_settings::Flags) -> Self {
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let reg_universe = create_reg_universe_systemv(&flags);
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Self {
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triple,
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flags,
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_x64_flags: x64_flags,
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reg_universe,
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}
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}
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fn compile_vcode(&self, func: &Function, flags: Flags) -> CodegenResult<VCode<inst::Inst>> {
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// This performs lowering to VCode, register-allocates the code, computes
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// block layout and finalizes branches. The result is ready for binary emission.
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let abi = Box::new(abi::X64ABIBody::new(&func, flags)?);
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compile::compile::<Self>(&func, self, abi)
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}
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}
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impl MachBackend for X64Backend {
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fn compile_function(
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&self,
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func: &Function,
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want_disasm: bool,
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) -> CodegenResult<MachCompileResult> {
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let flags = self.flags();
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let vcode = self.compile_vcode(func, flags.clone())?;
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let buffer = vcode.emit();
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let buffer = buffer.finish();
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let frame_size = vcode.frame_size();
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let disasm = if want_disasm {
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Some(vcode.show_rru(Some(&create_reg_universe_systemv(flags))))
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} else {
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None
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};
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Ok(MachCompileResult {
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buffer,
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frame_size,
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disasm,
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})
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}
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fn flags(&self) -> &Flags {
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&self.flags
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}
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fn name(&self) -> &'static str {
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"x64"
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}
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fn triple(&self) -> Triple {
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self.triple.clone()
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}
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fn reg_universe(&self) -> &RealRegUniverse {
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&self.reg_universe
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}
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fn unsigned_add_overflow_condition(&self) -> IntCC {
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// Unsigned `>=`; this corresponds to the carry flag set on x86, which happens on
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// overflow of an add.
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IntCC::UnsignedGreaterThanOrEqual
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}
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fn unsigned_sub_overflow_condition(&self) -> IntCC {
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// unsigned `>=`; this corresponds to the carry flag set on x86, which happens on
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// underflow of a subtract (carry is borrow for subtract).
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IntCC::UnsignedGreaterThanOrEqual
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}
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}
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/// Create a new `isa::Builder`.
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pub(crate) fn isa_builder(triple: Triple) -> IsaBuilder {
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IsaBuilder {
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triple,
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setup: x64_settings::builder(),
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constructor: isa_constructor,
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}
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}
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fn isa_constructor(
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triple: Triple,
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shared_flags: Flags,
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builder: shared_settings::Builder,
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) -> Box<dyn TargetIsa> {
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let isa_flags = x64_settings::Flags::new(&shared_flags, builder);
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let backend = X64Backend::new_with_flags(triple, shared_flags, isa_flags);
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Box::new(TargetIsaAdapter::new(backend))
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}
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